 Sick running engine, FI Problem? |
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| xperu |
 Mar 17 2007, 10:03 AM
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#1
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TEXAS  Group: Members Posts: 597 Joined: 13-June 06 From: League City Texas Member No.: 6,213 Region Association: None 
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I have a 73 1.7 with FI.............. I am having problems when accelerating, the engine hesitates or jerks severely and will smoothes out after driving down the road, but I can feel the periodic missing. I had the car checked out for a possible electrical short and the electrical checked out good. I would appreciate your expertise and any suggestions or list of possible components that might be the problem.
I share the compassion for my 914, but reliability and to much garage time to the point of cerebration creeping into my mind; please help . |
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| bd1308 |
Mar 17 2007, 10:07 AM
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#2
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
once you get the big stuff sorted out, it gets VERY reliable
my car has been running daily for a long time. it starts and runs |
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| jim912928 |
Mar 17 2007, 10:07 AM
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#3
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Senior Member Group: Members Posts: 1,485 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
I had something similar and found it to be the connectors on my fuel injectors..wires were old and would make contact and then not. It was random and drove me nuts until I started jiggling the fuel injector wires.
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| Bleyseng |
Mar 17 2007, 10:19 AM
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#4
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Can be lots of issues:
dirty injectors/gas-change fuel filter bad FI grounds-clean bad FI connectors/wires-fix or replace vacuum leaks-find and fix or replace hoses/gaskets sticking advance- clean dizzy and lube dirty TPS-clean or replace Its a 30yr ole car, it does have maintanence that needs to be done on it. (IMG:style_emoticons/default/chair.gif) |
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| dr914@autoatlanta.com |
Mar 17 2007, 10:27 AM
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#5
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914 Guru Group: Members Posts: 7,894 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
call me and we can work through it if you like.
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| jk76.914 |
Mar 17 2007, 11:32 AM
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#6
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Senior Member Group: Members Posts: 809 Joined: 12-April 05 From: Massachusetts Member No.: 3,925 Region Association: North East States |
Mine was a lean miss. Happened around 3000-3750 rpm, then smoothed out. I finally verified it by tweaking the fuel pressure up to about 32 PSI. That was just to test the theory, because that richens the mixture across the board. Finally replaced the fuel injectors.
You can also try a ballast resistor in series with the cylinder head temp sensor. If the miss goes away, you've confirmed a lean miss. 10% ethanol in our fuels doesn't help. If you're running right on the edge, mixture wise, with gasoline, you may be too lean with the gasohol. I haven't been able to prove anything either way, since I can't get pure gasoline anymore here in the Northeast, but with no lambda feedback to correct for it, it doesn't help. Jim |
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| sean_v8_914 |
Mar 18 2007, 01:19 AM
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#7
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
there are only 23 connections on teh ECU plug. it should take less than 30 minutes to do a full system check. pull the ECU. remove the connector. test per teh values on :
http://members.rennlist.com/pbanders/DJetParts.htm it is oNLY 17 check points done with a simple ohm meter. this will check teh FI components thru teh FI wire harness. if you get a bad reading, wiggle the connector at the compnent, if still bad, measure the component directly |
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| sean_v8_914 |
Mar 18 2007, 01:20 AM
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#8
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
piece O pie
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| SGB |
Mar 18 2007, 09:40 AM
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#9
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
you might try changing sparkplugs first....
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